Ok here's the deal. Have a deli display case that I changed the compressor in(R-22). I tried to evacuate it and could only get down to about 2700. I'm using AK-900 and Blue Vac micron-meter. I then checked for leaks with 125psi of nitrogen and could not find any bubbles but the high side is leakin at about 1psi a minute. So I put 125 psi on both sides and left it over night. This morning the low side was still at 125 and the high side was down to 40 psi. I still cannot find a leak. Anyone got any suggestions or tips on what to do next? Thanks for any help in advance!